DIN Rail Shield

ABSTRACT

A shield device includes: a first electrical conductor; an electrical insulator that is configured to electrically insulate the first electrical conductor from a second electrical conductor; a first shield connector configured to: directly contact at least 180 degrees of a first circumference of a first shield that surrounds at least two first insulated conductors of a first section of a shielded cable; and electrically connect the first shield with the first electrical conductor; and a second shield connector configured to: directly contact at least 180 degrees of a second circumference of a second shield that surrounds at least two second insulated conductors of a second section of the shielded cable; and electrically connect the second shield with the first electrical conductor.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure is a continuation of U.S. patent application Ser.No. 16/587,520 filed on Sep. 30, 2019. The entire disclosure of theapplication referenced above is incorporated herein by reference.

FIELD

The present disclosure relates to electrical conductors and moreparticularly to electrical shield devices.

BACKGROUND

The background description provided here is for the purpose of generallypresenting the context of the disclosure. Work of the presently namedinventors, to the extent it is described in this background section, aswell as aspects of the description that may not otherwise qualify asprior art at the time of filing, are neither expressly nor impliedlyadmitted as prior art against the present disclosure.

Variable speed drives (VSDs) can also be referred to as adjustable speeddrives (ASDs). VSDs may include insulated gate bipolar transistors(IGBTs) due to their lower switching losses, smaller package sizes, andlower cost than other types of switching devices.

VSDs can power various different types of electrical loads and are usedin various different types of industries, such as automotive, food andbeverage, mining, energy, theater, automatic car washes, heatingventilation and air conditioning (HVAC), and other industries.

SUMMARY

In a feature, a shield device includes: an electrical conductor; anelectrical insulator that is configured to electrically insulate theelectrical conductor from a DIN rail and to hang the shield device fromthe DIN rail; a first shield connector configured to: directly contactat least 180 degrees of a first circumference of a first shield thatsurrounds at least two insulated conductors of a first section of ashielded cable; and electrically connect the first shield with theelectrical conductor; and a second shield connector configured to:directly contact at least 180 degrees of a second circumference of asecond shield that surrounds at least two insulated conductors of asecond section of the shielded cable; and electrically connect thesecond shield with the electrical conductor.

In further features, the electrical conductor has uniform length, width,and thickness.

In further features, the electrical conductor is planar.

In further features, the shield device further includes a secondelectrical insulator located between the electrical conductor and asecond DIN rail and configured to electrically insulate the electricalconductor from the second DIN rail.

In further features, the shield device further includes the second DINrail.

In further features, the second DIN rail is configured to hang one ormore terminal blocks from the second DIN rail.

In further features, the second electrical insulator includes adielectric paper.

A system includes: a load; a variable speed drive; and the shielddevice, where the shield device is connected between the load and thevariable speed drive.

In further features, centers of the first and second shield connectorsare offset from a vertical centerline of the shield device.

In further features, centers of the first and second shield connectorsare located on a vertical centerline of the shield device.

In further features, the shield device further includes a clampingdevice configured to clamp an electrical insulator that surrounds thesecond shield of the second section of the shielded cable.

In further features, the shielded cable satisfies the 2018 edition ofthe National Fire and Protection Association (NFPA) 79 electricalstandard for industrial machinery.

In a feature, a shield device includes: an electrical conductor; anelectrical insulator that is configured to electrically isolate theelectrical conductor from a DIN rail and to hang the shield device fromthe DIN rail; a first shield connector configured to: directly contact afirst shield; and electrically connect the first shield with theelectrical conductor; and a second shield connector configured to:directly contact at least 180 degrees of a circumference of a secondshield that surrounds at least two insulated conductors of a secondsection of a shielded cable; and electrically connect the second shieldwith the electrical conductor.

In further features, the electrical conductor has uniform length, width,and thickness.

In further features, the electrical conductor is planar.

A system includes: a load; a variable speed drive; and the shielddevice, where the shield device is connected between the load and thevariable speed drive.

In further features, the shield device further includes a clampingdevice configured to clamp an electrical insulator that surrounds thesecond shield of the second section of the shielded cable.

In further features, the first shield is a flat braid shield.

In further features, the first shield connector includes an electricallyconductive fastener configured to fasten the first shield to theelectrical conductor.

In further features, the fastener includes a screw.

In further features, the first shield includes a flat braid connectorthat is electrically connected to an end of the first shield.

In further features, the flat braid connector includes an aperturethrough which the fastener extends.

In further features, the shielded cable satisfies the 2018 edition ofthe National Fire and Protection Association (NFPA) 79 electricalstandard for industrial machinery.

In a feature, a shield device includes: an electrical conductor having afirst portion and a second portion; an electrical insulator that isfixed to the first portion and that is configured to electricallyisolate the electrical conductor from a DIN rail and to hang the shielddevice from the DIN rail; a first cable gland that is engaged with thesecond portion of the electrical conductor and that is configured to:engage a first shield that surrounds at least two insulated conductorsof a first section of a shielded cable; and electrically connect thefirst shield with the electrical conductor; and a second cable glandthat is engaged with the second portion of the electrical conductor andthat is configured to: engage a second shield that surrounds at leasttwo insulated conductors of a second section of the shielded cable; andelectrically connect the second shield with the electrical conductor.

In further features, the second portion is perpendicular to the firstportion.

In further features: the first cable gland is coupled to a firstcircular aperture in the second portion of the electrical conductor; andthe second cable gland is coupled to a second circular aperture in thesecond portion of the electrical conductor.

In further features, the electrical conductor is made of aluminum.

A system includes: a load; a variable speed drive; and the shielddevice, where the shield device is connected between the load and thevariable speed drive.

In further features, the shield device further includes a clampingdevice configured to clamp a first electrical insulator that surroundsthe first shield of the first section of the shielded cable.

In further features, the clamping device is further configured to clampa second electrical insulator that surrounds the second shield of thesecond section of the shielded cable.

In further features, the shielded cable satisfies the 2018 edition ofthe National Fire and Protection Association (NFPA) 79 electricalstandard for industrial machinery.

Further areas of applicability of the present disclosure will becomeapparent from the detailed description, the claims and the drawings. Thedetailed description and specific examples are intended for purposes ofillustration only and are not intended to limit the scope of thedisclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will become more fully understood from thedetailed description and the accompanying drawings, wherein:

FIG. 1 is a functional block diagram of a variable speed drive (VSD)powering a load;

FIGS. 2-4 are functional block diagrams of example implementations ofthe VSD where the load is an electric motor;

FIG. 5 includes a functional block diagram where terminal blocks areconnected between the VSD and the electric motor;

FIG. 6 includes a functional block diagram where a disconnect iselectrically connected between the VSD and the electric motor;

FIGS. 7A and 7B include a functional block diagram of an exampleimplementation of a shield device;

FIG. 8 is a side view of an example implementation of the shield deviceof FIG. 7A;

FIG. 9 is a front view of the example implementation of the shielddevice of FIG. 7A;

FIG. 10 is a rear view of the example implementation of the shielddevice of FIG. 7A;

FIG. 11 is a top view of the example implementation of the shield deviceof FIG. 7A;

FIG. 12 is an example illustration of the shield device mounted to asecond DIN rail with examples of terminal blocks mounted to a first DINrail;

FIG. 13 is a cross-sectional view of the shield device of FIG. 12;

FIG. 14 is an example front view of the shield device of FIG. 7A;

FIG. 15 includes a front view of the shield device of FIG. 14;

FIG. 16 is a side view of an example implementation of the shield deviceof FIG. 14;

FIG. 17 is a front view of the example implementation of the shielddevice of FIG. 14;

FIG. 18 is a rear view of the example implementation of the shielddevice of FIG. 14;

FIG. 19 is a top view of the example implementation of the shield deviceof FIG. 14;

FIG. 20 is a front view of an example of the shield devices of FIGS.8-19 with an insulator clamp;

FIG. 21 is a rear view of the example of the shield devices of FIGS.8-19 with an insulator clamp;

FIG. 22 is a front view of an example of an insulator clamp;

FIG. 23 includes a top view of the example of the insulator clamp ofFIG. 22;

FIG. 24 is a side view of an example implementation of the shield deviceof FIG. 7A;

FIG. 25 is a front view of the example implementation of the shielddevice of FIG. 24;

FIG. 26 is a rear view of the example implementation of the shielddevice of FIG. 24;

FIG. 27 is a top view of the example implementation of the shield deviceof FIG. 24;

FIG. 28 includes an example implementation of the shield device of FIGS.24-27 with a terminal block and a disconnect;

FIG. 29 includes a front view of an example of the shield devices ofFIGS. 24-28 with an insulator clamp;

FIG. 30 includes a side view of the example of the shield devices 700 ofFIGS. 24-28 with the insulator clamp;

FIG. 31 is a side view of an example implementation of the shield deviceof FIG. 7A;

FIG. 32 is a front view of the example implementation of the shielddevice of FIG. 31;

FIG. 33 is a top view of the example implementation of the shield deviceof FIG. 31;

FIG. 34 is a close up front view of the example of the shield device ofFIGS. 31-33;

FIG. 35 is a zoomed out front side view of the shield device of FIGS.31-33;

FIG. 36 includes a front view of an example of the shield devices ofFIGS. 31-35 with an insulator clamp;

FIG. 37 includes a side view of the example of the shield devices ofFIGS. 31-35 with the insulator clamps;

FIG. 38 includes a front view of an example of an insulator clamps thatcan be provided separately from the shield device;

FIG. 39 includes a top view of the example of the insulator clamp ofFIG. 38; and

FIG. 40 includes a side view of the example of the insulator clamps ofFIG. 38.

In the drawings, reference numbers may be reused to identify similarand/or identical elements.

DETAILED DESCRIPTION

Variable speed drives can be used to control speed and torque of anelectric motor. VSDs may include semiconductors that use insulated gatebipolar transistors (IGBTs) that switch and control power output to theelectric motor because IGBTs may allow for higher carrier and/orswitching frequencies. Higher carrier and/or switching frequencies maydecrease current ripple and allow for better performance of torque inelectric motors, such as at lower speeds and/or operating frequencies.This may increase process performance.

Higher carrier frequencies also reduce electric motor lamination noiseand decrease motor sound production. Decreased sound production may bevaluable in various different industries, such as theaters andhospitals. Higher carrier frequencies also allow for less harmonicheating in the motor, which results in increased motor longevity andreliability.

Faster switching IGBTs, however, may increase noise frequencies. Noisemay increase as IGBT switching increases. The value of increasing thecarrier frequency, which determines the repetition rate of these noisecurrents being coupled to ground, may be worse for installations thatmust break/cut and re-terminate any shielded output cables connectedbetween an electric motor and a VSD.

The NFPA 79 standard, 2018 edition, mandates the use of shielded cablebetween VSDs and motors. Some installations require that the shieldedcable be broken/cut and re-terminated between VSD and motor, forexample, to shut off power to motor and/or perform maintenance on motorswithout having to shut off the VSDs. Some industries may not shut offpower to main control panels (including VSDs) and communications tonetworked systems as they may lose production.

Installations may be incorrect to manage the noise frequencies. Noisemay be worsened if the shielded cable is broken/cut and re-terminatedwith the high frequency common mode noise (carried on the shield) iscoupled to lower frequency 50/60 Hz circuits. Common mode noise is atype of electrical noise that is induced on signals with respect toreferenced ground. This is a source of noise that is coupled byconduction or radiation, and circuits and sensitive equipment aresusceptible to the magnitude, frequency, and repetition rate (carrier)of common mode noise.

Without isolating high frequency currents from a motor with the shieldedcable being broke/cut and re-terminated, noise issues may dictate thatthe VSD be controlled at lower carrier and switching frequencies, thusnot taking advantage of the abilities of the IGBTs. Using lowerfrequencies in this setting reduces the repetition rate of the noisecreated. The present application involves shield devices that isolatethe shields from the lower frequency circuitry.

Capacitive stray coupling of common mode noise may be problematic. Forexample, noise cause metal detecting machinery to be unable to detectmetal in products, such as food. Circuits can also store high frequencycurrents, increasing a possibility of current build up/shorts. Also,mixing the high frequency common mode current with lower 50/60 Hzfrequency equipment may not be desirable.

In grounding systems that are solid ground (XO on transformer ground),transient noise currents complete a path in the system and an antenna isformed. Training the noise to not affect equipment/personnel may bedesirable.

The present application involves shield devices that enable the shieldedcable to be broken/cut and re-terminated between VSDs and motors. Theshield devices include shield connectors configured to electricallycouple to the shield portion of the shield cables. The shield devicealso includes an electrical conductor that is electrically connected tothe shield connectors such that the shields of the shield cables areelectrically connected via the shield device. The shield device alsoincludes an electrical isolator, such as a DIN rail connector, thatelectrically isolates the shields from other electrical components.

FIG. 1 is a functional block diagram of an example implementationincluding a variable speed drive (VSD) 100 powering a load 104. VSDs canalso be referred to as adjustable speed drives (ASDs). While the exampleof a variable speed drive is discussed, the present application is alsoapplicable to other types of drives, such as variable frequency drives.

The VSD 100 receives alternating current (AC) input power, such as threephase AC input power. Based on the AC input power, the VSD 100 outputspower to the (electrical) load 104. For example, the VSD 100 may outputthree-phase AC power to the load 104. Other types of VSDs output directcurrent (DC) power to the load 104.

FIG. 2 is a functional block diagram of an example implementation of theVSD 100 where the load 104 is an electric motor 204. While the exampleof the load 104 being the electric motor 204 will be discussed, thepresent application is also applicable to other types of loads.

The VSD 100 may include an AC/DC converter 208 that converts the ACinput power to direct current (DC) power and outputs a DC voltage to aDC bus 212. The AC/DC converter 208 may be a passive AC/DC converter,such as a rectifier (e.g., full-wave). In various implementations, theAC/DC converter 208 may be an active converter or include one or moreactive components, such as for a buck converter, a boost converter, or acombination buck/boost converter. In the example of the AC/DC converter208 including one or more active components or being an activeconverter, a control module 216 may control switching of the AC/DCconverter 208. The DC bus 212 may include, for example, one or morecapacitors and/or one or more other components.

A DC/AC converter 220 converts DC power from the DC bus 212 into ACpower and outputs the AC power to the electric motor 204. The DC/ACconverter 220 may be, for example, an inverter (e.g., a three-phaseinverter) or another suitable type of DC/AC converter. The controlmodule 216 controls switching of the DC/AC converter 220 to control theAC power output to the electric motor 204, such as voltage, current,phase angle(s), and other characteristics of the AC power output.

FIG. 3 is also a functional block diagram of the example implementationof the VSD 100 where the load 104 is the electric motor 204. As shown inFIG. 3, in various implementations, a disconnect 300 may be electricallyconnected between the VSD 100 and the electric motor 204. The disconnect300 may be a manual disconnect or an automatic disconnect. Thedisconnect 300 electrically disconnects the electric motor 204 from theVSD 100 when the disconnect 300 is open. The disconnect 300 electricallyconnects the electric motor 204 with the VSD 100 when the disconnect 300is closed. In addition to connecting and disconnecting the VSD 100 andthe electric motor 204, the disconnect 300 may allow for one or moremeasurements to be taken (e.g., via a probe) between the VSD 100 and theelectric motor 204.

FIG. 4 is also a functional block diagram of the example implementationof the VSD 100 where the load 104 is the electric motor 204. As shown inFIG. 4, in various implementations, terminal blocks 400 may beelectrically connected between the VSD 100 and the electric motor 204.The terminal blocks 400 may allow for one or more measurements to betaken (e.g., via a probe) between the VSD 100 and the electric motor204.

Referring to FIGS. 3 and 4, the VSD 100 receives the AC input power bywire. The VSD 100 outputs power to the electric motor 204 by wire, suchas via a shielded cable. The shielded cable may include cross-linkedpolyethylene (XLPE). The shielded cable satisfies the National Fire andProtection Association (NFPA) 79 electrical standard for industrialmachinery. The NFPA 79 standard may be the 2018 edition or a lateredition. The shielded cable may include, for example, one insulatedground conductor, three insulated reference conductors (e.g., U, V, W,or A, B, C), a shield (e.g., braided) that surrounds the ground andreference conductors, and an external insulator that surrounds theshield. In various implementations, more than one shielded cable may beconnected per phase, for example, for higher horsepower electric motors.

FIG. 5 includes a functional block diagram illustrative of the exampleof FIG. 4 where the terminal blocks 400 are connected between the VSD100 and the electric motor 204. A first length (portion) 504 of theshielded cable is electrically connected between respective outputterminals of the VSD 100 and first terminals of respective ones of theterminal blocks 400. A second length (portion) 508 of the shielded cableis electrically connected between second terminals of the respectiveones of the terminal blocks 400 and respective terminals of the electricmotor 204. Each of the terminal blocks 400 has its first terminalinternally electrically connected to its second terminal. As discussedfurther below, the terminal blocks 400 may be hung from a DIN rail.

A shield device 550 includes an electrical conductor to which theshields of the first and second lengths 504 and 508 are electricallyconnected. The shield device 550 also includes an electrical insulatorthat electrically isolates/insulates the conductor of the shield device550 (and therefore the shields of the shielded cable) from the DIN railand any other components that are electrically connected to the DINrail. The shield device 550 isolates the high frequency noise carried onthe shields of the first and second lengths 504 and 508 of the shieldedcable from other components and other noise (e.g., low frequency noise).

FIG. 6 includes a functional block diagram illustrative of the exampleof FIG. 3 where the disconnect 300 is electrically connected between theVSD 100 and the electric motor 204. In this example, the first length504 of the shielded cable is electrically connected between respectiveoutput terminals of the VSD 100 and respective first terminals of thedisconnect 300. The second length 508 of the shielded cable iselectrically connected between respective second terminals of thedisconnect 300 and respective terminals of the electric motor 204.

As discussed further below, the shields of the first and second lengths504 and 508 of the shielded cable are electrically connected to eachother via an electrical conductor of a shield device 650. The shield ofthe first length 504 and the shield of the second length 508 are notelectrically connected to the disconnect 300. The shield device 650isolates the high frequency noise carried on the shields of the firstand second lengths 504 and 508 of the shielded cable from othercomponents and other noise (e.g., low frequency noise).

FIG. 7A includes a functional block diagram of an example implementationof a shield device 700, such as the shield device 550 and the shielddevice 650. The shield device 700 includes an electrical conductor 704,a first shield connector 708, and a second shield connector 712.Examples of the first and second shield connectors 708 and 712 areillustrated.

The first and second shield connectors 708 and 712 are electricallyconnected to the electrical conductor 704 and are configured toelectrically connect to the shield of the shielded cable radially aroundthe shielded cable. Examples of the electrical conductor 704 areillustrated.

The shield device 700 also includes an electrical insulator 716 thatelectrically isolates the electrical conductor 704 from otherelectrically conductive components. The electrical insulator 716 mayinclude, for example, DIN rail connectors that are configured to couple(and hang) the shield device 700 from a DIN rail. The shield device 700may also include one or more other electrical insulators, as discussedfurther below.

In various implementations, the shield device 700 may also include oneor more (insulator) clamps 720 (clamping devices). The clamp(s) 720 maybe used to grasp (clamp) the outer electrical insulator around one ormore of the lengths of the shielded cable. The clamp(s) 720 may, forexample, help prevent disconnection of the lengths of the shieldedcable, for example, if weight is applied to the lengths of the shieldedcable. In one example, the clamps 720 may include insulated cable tiestrain reliefs.

In the example of more than one shielded cable being connected perphase, for example, for higher horse power electric motors, the shielddevice 700 include a set of two shield connectors per shielded cable.For example, if two shielded cables are connected per phase of anelectric motor, the shield device 700 may include 4 shield connectors,as illustrated in FIG. 7B.

FIG. 8 is a side view of an example implementation of the shield device700. FIG. 9 is a front view of the example implementation of the shielddevice 700 of FIG. 7A. FIG. 10 is a rear view of the exampleimplementation of the shield device 700 of FIG. 7A. FIG. 11 is a topview of the example implementation of the shield device 700 of FIG. 7A.

Referring to FIGS. 8-11, the shield device 700 includes the first shieldconnector 708, the second shield connector 712, and the electricalconductor 704. The shield device 700 also includes an electricalinsulator 802. The electrical insulator 802 may include, for example, adielectric sheet (e.g., paper), such as ITW Formex dielectric paper. Theelectrical insulator 802 electrically isolates the electrical conductor704 from a DIN rail 804. The DIN rail 804 may be, for example, a 15millimeter (mm) DIN rail, a 35 mm DIN rail, or another suitable type ofDIN rail.

The electrical conductor 704 may be, for example, an aluminum bar oranother suitable type of electrical conductor and/or material (e.g.,copper, steel, etc.). The electrical conductor 704 may be planar andhave a uniform width, length, and thickness.

The shield device 700 also includes a DIN rail connector 808. The DINrail connector 808 serves as the electrical insulator 716. The DIN railconnector 808 is configured to couple (and hang) the shield device 700to a second DIN rail. The second DIN rail may be, for example, a 15 mmDIN rail, a 35 mm DIN rail, or another suitable type of DIN rail. TheDIN rail connector 808 has one or more features 812 configured to holdthe shield device 700 to the second DIN rail. The DIN rail connector 808is also releasable from the second DIN rai. The DIN rail connector 808is an electrical insulator and may be made of, for example, a dielectricmaterial or another suitable type of electrically insulative/isolativematerial. The DIN rail connector 808 electrically isolates theelectrical conductor 704 from the second DIN rail and any othercomponents that are electrically connected to the second DIN rail.

The DIN rail connector 808 may be fixed to the electrical conductor 704via one or more fasteners, such as screws 816. In variousimplementations, the DIN rail connector 808 may be fixed to theelectrical conductor 704 in another suitable manner, such as via anadhesive or via one or more other types of fasteners. In an example, thescrews 816 may be #8-32×⅜″ screws. The holes for the screws through theelectrical conductor 704 may be countersunk.

The DIN rail 804 may be fixed via one or more fasteners, such as screws820 and nuts 824. This may sandwich the electrical insulator 802directly between the DIN rail 804 and the electrical conductor 704. Invarious implementations, the DIN rail 804 may be fixed to the electricalinsulator 802, and the electrical insulator 802 may be fixed to theelectrical conductor 704 in another suitable manner, such as via anadhesive or via one or more other types of (e.g., non-conductive)fasteners. In an example, the screws 820 may be #8-32×½″ screws. Theholes for the screws 820 may be countersunk.

The first and second shield connectors 708 and 712 are electricallyconductive and are electrically connected to the electrical conductor704. The first and second shield connectors 708 and 712 may be fixed tothe electrical conductor 704 via one or more fasteners, such as screwsor rivets 824. In various implementations, the first and second shieldconnectors 708 and 712 may be fixed to the electrical conductor 704 inanother suitable manner, such as via an electrically conductive adhesiveor via one or more other types of fasteners. In this example, the firstand second shield connectors 708 and 712 are shield clamps.

The first and second shield connectors 708 and 712 are configured toelectrically contact (and directly contact) as much of the 360 degreesurface area of the shield portion (once exposed) of the first andsecond lengths 504 and 508 of the shielded cable as possible. The firstand second shield connectors 708 and 712 may electrically contact atleast 180 degrees of a circumference of the shield portion, at least 210degrees of the circumference, at least 240 degrees of the circumference,at least 270 degrees of the circumference, or at least 300 degrees ofthe circumference. The first and second shield connectors 708 and 712may be, for example, metal cable clamps, such as EMC shield clamps byIcotek or another suitable type of electrically conductive shield clamp.

The terminal blocks 400 are configured to securely hold to the DIN rail804. The first and second lengths 504 and 508 of the shielded cable canbe connected to the terminal blocks 400 as described above.

Example dimensions for the example of FIGS. 7-11 are as follows fordifferent motors having different horsepower (HP) ratings.

HP A B C D E F G H I 1 0.75 2.50 2.50 6.375 0.551 0.315 0.787 1.37800.5625 2 0.75 2.50 2.50 6.375 0.551 0.315 0.787 1.3780 0.5625 3 0.752.50 2.50 6.375 0.551 0.315 0.787 1.3780 0.5625 5 0.75 2.50 2.50 6.3750.551 0.315 0.787 1.3780 0.5625 10 0.75 2.50 2.50 6.375 0.551 0.3150.787 1.3780 0.5625 15 0.75 2.50 2.50 6.375 0.827 0.315 1.083 1.37800.5625 20 1.50 2.50 2.50 6.375 0.827 0.315 1.083 1.8898 1.125 25 1.502.50 2.50 6.375 0.827 0.315 1.083 1.8898 1.125 30 1.50 3.00 3.00 7.3750.827 0.315 1.083 1.8898 1.125 40 1.50 3.00 3.00 7.375 1.043 0.315 1.3581.8898 1.125 50 2.50 3.50 3.50 8.375 1.378 0.315 1.555 4.0000 2.125 602.50 4.00 4.00 9.375 1.378 0.315 1.555 4.0000 2.125 75 2.50 4.00 4.009.375 1.378 0.315 1.555 4.0000 2.125 100 2.50 4.50 4.50 10.375 1.9020.433 2.154 4.0000 2.125 125 2.50 5.00 5.00 11.375 1.902 0.433 2.1544.0000 2.125 150 2.50 5.50 5.50 12.375 1.902 0.433 2.154 4.0000 2.125200 2.50 6.00 6.00 13.375 2.165 0.512 2.638 4.0000 2.125 HP J K L M N O1 0.9375 1.000 1.250 0.1875 2.625 1.4331 2 0.9375 1.000 1.250 0.18752.625 1.4331 3 0.9375 1.000 1.250 0.1875 2.625 1.4331 5 0.9375 1.0001.250 0.1875 2.625 1.5906 10 0.9375 1.000 1.250 0.1875 2.625 1.5906 150.9375 1.000 1.250 0.1875 2.625 1.5906 20 1.500 1.000 1.250 0.1875 2.6251.9055 25 1.500 1.000 1.250 0.1875 2.625 1.9055 30 1.500 1.000 1.2500.1875 2.625 2.1890 40 1.500 1.000 1.250 0.1875 2.625 2.8504 50 3.0001.750 1.500 0.3750 4.000 3.4646 60 3.000 1.750 1.500 0.3750 4.000 3.464675 3.000 1.750 1.500 0.3750 4.000 3.4646 100 3.000 1.750 1.500 0.37504.000 5.3307 125 3.000 1.750 1.500 0.3750 4.000 7.3386 150 3.000 1.7501.500 0.3750 4.000 7.3386 200 3.000 1.750 1.500 0.3750 4.000 7.3386

FIG. 12 includes an example image of the shield device 700 mounted to asecond DIN rail 1204 with examples of the terminal blocks 400 mounted tothe DIN rail 804. FIG. 13 is a cross-sectional view of the shield device700 of FIG. 12. In various implementations, one or more of the terminalblocks 400 may be replaced with one or more contactors.

As shown in FIGS. 12 and 13, the (outer) insulator 1208 is stripped fromends 1212 of the first and second lengths 504 and 508 of the shieldedcable to expose shields 1216 (e.g., braided) of the first and secondlengths 504 and 508 of the shielded cable. The shields 1216 encircleinsulated conductors 1220 (the reference conductors and the groundconductor) of the first and second lengths 504 and 508 of the shieldedcable. Ends of the insulated conductors 1220 are stripped of theinsulation and connected to the terminal blocks 400, respectively.

FIG. 14 is an example front view of the shield device 700 with anothertype of the first shield connector 708. In various implementations, theshield 1216 and the insulator 1208 may be stripped from the first length504 of the shielded cable, and the insulated conductors 1220 may beconnected between the VSD 100 and the terminal blocks 400. In suchimplementations, the insulated conductors 1220 of the first length 504of the shielded cable are connected at a first end to output terminals1404 of the VSD 100 and at second ends to the first terminals of theterminal blocks 400.

A shield conductor 1408 is connected at a first end to a shield outputterminal 1412 of the VSD 100 and at a second end to the electricalconductor 704 via the first shield connector 708. In this example, theshield conductor 1408 may be a flat braid conductor (e.g., by AlphaWire), and the first shield connector 708 may include a fastener, suchas a screw 1416, configured to connect a flat braid connector that isconnected to the flat braid conductor to the electrical conductor 704.In various implementations, the first shield connector 708 may betransition or interference fit onto the end of the electrical conductor704.

FIG. 15 includes a front view of the shield device 700 of FIG. 14without the insulated conductors 1220. FIG. 16 is a side view of anexample implementation of the shield device 700. FIG. 17 is a front viewof the example implementation of the shield device 700 of FIG. 14. FIG.18 is a rear view of the example implementation of the shield device 700of FIG. 14. FIG. 19 is a top view of the example implementation of theshield device 700 of FIG. 14.

Example dimensions for the example of FIGS. 16-19 are as follows fordifferent motors having different HP ratings.

HP A B C D E F G H I 1 0.75 2.50 1.50 5.375 0.551 0.315 0.787 1.37800.5625 2 0.75 2.50 1.50 5.375 0.551 0.315 0.787 1.3780 0.5625 3 0.752.50 1.50 5.375 0.551 0.315 0.787 1.3780 0.5625 5 0.75 2.50 1.50 5.3750.551 0.315 0.787 1.3780 0.5625 10 0.75 2.50 1.50 5.375 0.551 0.3150.787 1.3780 0.5625 15 0.75 2.50 1.50 5.375 0.827 0.315 1.083 1.37800.5625 20 1.50 2.50 1.50 5.375 0.827 0.315 1.083 1.8898 1.125 25 1.502.50 1.50 5.375 0.827 0.315 1.083 1.8898 1.125 30 1.50 3.00 1.50 5.8750.827 0.315 1.083 1.8898 1.125 40 1.50 3.00 1.50 5.875 1.043 0.315 1.3581.8898 1.125 50 2.50 3.50 1.50 6.375 1.378 0.315 1.555 4.0000 2.125 602.50 4.00 1.50 6.875 1.378 0.315 1.555 4.0000 2.125 75 2.50 4.00 1.506.875 1.378 0.315 1.555 4.0000 2.125 100 2.50 4.50 1.50 7.375 1.9020.433 2.154 4.0000 2.125 125 2.50 5.00 1.50 7.875 1.902 0.433 2.1544.0000 2.125 150 2.50 5.50 1.50 8.375 1.902 0.433 2.154 4.0000 2.125 2002.50 6.00 1.50 8.875 2.165 0.512 2.638 4.0000 2.125 HP J K L M N O P 10.9375 1.000 1.250 0.1875 2.625 1.4331 0.750 2 0.9375 1.000 1.250 0.18752.625 1.4331 0.750 3 0.9375 1.000 1.250 0.1875 2.625 1.4331 0.750 50.9375 1.000 1.250 0.1875 2.625 1.5906 0.750 10 0.9375 1.000 1.2500.1875 2.625 1.5906 0.750 15 0.9375 1.000 1.250 0.1875 2.625 1.59060.750 20 1.500 1.000 1.250 0.1875 2.625 1.9055 0.750 25 1.500 1.0001.250 0.1875 2.625 1.9055 0.750 30 1.500 1.000 1.250 0.1875 2.625 2.18900.750 40 1.500 1.000 1.250 0.1875 2.625 2.8504 0.750 50 3.000 1.7501.500 0.3750 4.000 3.4646 1.000 60 3.000 1.750 1.500 0.3750 4.000 3.46461.000 75 3.000 1.750 1.500 0.3750 4.000 3.4646 1.000 100 3.000 1.7501.500 0.3750 4.000 5.3307 1.000 125 3.000 1.750 1.500 0.3750 4.0007.3386 1.000 150 3.000 1.750 1.500 0.3750 4.000 7.3386 1.000 200 3.0001.750 1.500 0.3750 4.000 7.3386 1.000

FIG. 20 includes a front view of an example of the shield devices 700 ofFIGS. 8-19 with the one of the clamps 720. FIG. 21 includes a rear viewof the example of the shield devices 700 of FIGS. 8-19 with the one ofthe clamps 720. In this example, the clamps 720 include insulated cabletie strain reliefs.

The clamp 720 may be configured to grasp the insulator 1208 of theshielded cable and vertically support the shielded cable. The clamp 720may be a (electrically) non-conductive clamp. For example only, theclamp 720 may be made of a plastic. In various implementations, theclamp 720 may include a tie wrap (e.g., a zip tie) that encircles theinsulator 1208 and that extends through holes 2000 in the electricalconductor 704. The clamp 720 may be manually adjustable ornon-adjustable. In various implementations, only one insulator clamp maybe provided with the second shield connector 712. Providing theinsulator clamp may help achieve one or more certification requirementsof a certification body, such as a certification requirement ofUnderwriters Laboratories (UL).

Example dimensions for the example of FIGS. 20-21 are as follows fordifferent motors having different HP ratings.

HP B V Q R U T 1 2.50 1.000 1.75 0.75 0.125 0.375 2 2.50 1.000 1.75 0.750.125 0.375 3 2.50 1.000 1.75 0.75 0.125 0.375 5 2.50 1.000 1.75 0.750.125 0.375 10 2.50 1.000 1.75 0.75 0.125 0.375 15 2.50 1.000 1.75 0.750.125 0.375 20 2.50 1.000 1.75 1.50 0.125 0.375 25 2.50 1.000 1.75 1.500.125 0.375 30 3.00 1.000 1.75 1.50 0.125 0.375 40 3.00 1.000 1.75 1.500.125 0.375 50 3.50 1.000 1.75 2.50 0.25 0.625 60 4.00 1.000 1.75 2.500.25 0.625 75 4.00 1.000 1.75 2.50 0.25 0.625 100 4.50 1.000 1.75 2.500.25 0.625 125 5.00 1.000 1.75 2.50 0.25 0.625 150 5.50 1.000 1.75 2.500.25 0.625 200 6.00 1.000 1.75 2.50 0.25 0.625

In various implementations, the clamp 720 may be separate from theshield device 700. FIG. 22 includes a front view of an example of theclamp 720 that can be provided separately from the shield device 700.FIG. 23 includes a top view of the example of the clamp 720 of FIG. 22.In the example of FIGS. 22 and 23, the clamp 720 may be mounted, forexample, to an enclosure vertically below the shield device 700.

As stated above, the clamp 720 may be adjustable. For example, the clamp720 may include one or more screws 2204 that engage threads in a portion2208 of the clamp 720. Turning of the screw(s) 2204 adjusts dimensionsof an inner aperture 2212 of the clamp 720 to retain and release theshielded cable.

Example dimensions for the example of FIGS. 22-23 are as follows fordifferent motors having different HP ratings.

HP A B C D E 1 1.000 0.750 0.509 0.509 0.750 2 1.000 0.750 0.509 0.5090.750 3 1.000 0.750 0.509 0.509 0.750 5 1.000 0.750 0.582 0.582 0.750 101.000 0.750 0.582 0.582 0.750 15 1.000 0.750 0.656 0.656 0.750 20 1.0001.500 0.707 0.707 1.500 25 1.000 1.500 0.807 0.807 1.500 30 1.000 1.5000.807 0.807 1.500 40 1.000 1.500 1.022 1.022 1.500 50 1.000 2.500 1.1581.158 2.500 60 1.000 2.500 1.332 1.332 2.500 75 1.000 2.500 1.332 1.3322.500 100 2.000 2.500 1.328 1.328 2.500 125 2.000 2.500 1.396 1.3962.500 150 3.000 2.500 1.801 1.801 2.500 200 3.000 2.500 1.996 1.9962.500

In various implementations, the first and second shield connectors 708and 712 may be offset (staggered) from each other. FIG. 24 is a sideview of an example implementation of the shield device 700. FIG. 25 is afront view of the example implementation of the shield device 700 ofFIG. 24. FIG. 26 is a rear view of the example implementation of theshield device 700 of FIG. 24. FIG. 27 is a top view of the exampleimplementation of the shield device 700 of FIG. 24.

As illustrated in FIGS. 25-27, the first and second shield connectors708 and 712 may be offset from each other. For example, as shown in FIG.25, a center of the first shield connector 708 may be located to theleft of a vertical centerline 2504 of the shield device 700 and a centerof the second shield connector 712 may be to the right of the verticalcenterline 2504. Alternatively, the first shield connector 708 may belocated to the right of the vertical centerline 2504, and the secondshield connector 712 may be located to the left of the verticalcenterline 2504.

A first distance between the center of the first shield connector 708and the vertical centerline 2504 may be equal to a second distancebetween the center of the second shield connector 712 and the verticalcenterline 2504. In various implementations, the first and seconddistances may be zero such that the centers of the first and secondshield connectors 708 and 712 fall on the vertical centerline 2504.

In this example, the DIN rail connector 808 serves as the electricalinsulator 716 and is made of electrically insulative (non-conductive)material. The example of FIGS. 24-27 may be used with one or more of theterminal blocks 400 and/or the disconnect 300.

Example dimensions for the example of FIGS. 24-27 are as follows fordifferent motors having different HP ratings.

HP A B C D E F G H I 1 3.00 3.00 0.25 0.25 0.551 0.315 0.787 2.62501.125 2 3.00 3.00 0.25 0.25 0.551 0.315 0.787 2.6250 1.125 3 3.00 3.000.25 0.25 0.551 0.315 0.787 2.6250 1.125 5 3.00 3.00 0.25 0.25 0.5510.315 0.787 2.6250 1.125 10 3.00 3.00 0.25 0.25 0.551 0.315 0.787 2.62501.125 15 3.00 3.00 0.25 0.25 0.827 0.315 1.083 2.6250 1.125 20 4.00 3.000.25 0.25 0.827 0.315 1.083 2.6250 1.125 25 4.00 3.00 0.25 0.25 0.8270.315 1.083 2.6250 1.125 30 4.00 3.00 0.25 0.25 0.827 0.315 1.083 2.62501.125 40 4.00 3.00 0.25 0.25 1.043 0.315 1.358 2.6250 1.125 50 4.00 3.000.25 0.25 1.378 0.315 1.555 2.6250 1.125 60 4.00 3.00 0.25 0.25 1.3780.315 1.555 2.6250 1.125 75 4.00 3.00 0.25 0.25 1.378 0.315 1.555 2.62501.125 100 6.00 4.00 0.25 0.25 1.902 0.433 2.154 4.0000 2.125 125 6.004.00 0.25 0.25 1.902 0.433 2.154 4.0000 2.125 150 6.00 4.00 0.25 0.251.902 0.433 2.154 4.0000 2.125 200 6.00 4.00 0.25 0.25 2.165 0.512 2.6384.0000 2.125 HP J K L M N O 1 1.315 5.000 2.685 0.8425 1.890 0.0625 21.315 5.000 2.685 0.8425 1.890 0.0625 3 1.315 5.000 2.685 0.8425 1.8900.0625 5 1.381 5.000 2.685 0.8095 1.890 0.0625 10 1.381 5.000 2.6850.8095 1.890 0.0625 15 1.472 5.000 2.685 0.7640 1.890 0.0625 20 1.9256.000 2.685 1.0375 1.890 0.0625 25 1.925 6.000 2.685 1.0375 1.890 0.062530 1.925 6.000 2.685 1.0375 1.890 0.0625 40 1.924 6.000 2.685 1.03801.890 0.0625 50 0.708 6.000 2.685 1.6460 1.890 0.0625 60 0.708 6.0002.685 1.6460 1.890 0.0625 75 0.708 6.000 2.685 1.6460 1.890 0.0625 1002.879 10.250 3.567 1.5605 4.000 0.0625 125 2.879 10.250 3.567 1.56054.000 0.0625 150 2.985 10.250 3.567 1.5075 4.000 0.0625 200 2.985 10.2503.488 1.5075 4.000 0.0625

FIG. 28 includes an example implementation of the shield device 700 ofFIGS. 24-27 with one of the terminal blocks 400 and the disconnect 300.As illustrated in FIG. 28, the DIN rail 804 may be omitted in variousimplementations, for example, when the disconnect 300 is used. Asillustrated in FIG. 28, the second DIN rail 1204 may be mounted to andelectrically connected to an enclosure 2804. A ground conductor 2808 mayalso electrically connect the enclosure 2804 to a ground referencepotential, such as a ground reference potential of the load.

FIG. 29 includes a front view of an example of the shield devices 700 ofFIGS. 24-28 with the two of the clamps 720. FIG. 30 includes a side viewof the example of the shield devices 700 of FIGS. 24-28 with the two ofthe clamps 720.

The clamps 720 may be configured to grasp the insulators 1208 of theshielded cable and vertically support the shielded cable. The clamps 720may be (electrically) non-conductive clamps. For example only, theclamps 720 may be made of a plastic. In various implementations, theclamps 720 may include tie wrap (e.g., zip ties) that encircle theclamps 720 and that extend through holes 2904 in the electricalconductor 704. The clamps 720 may be manually adjustable ornon-adjustable. In various implementations, only one insulator clamp maybe provided with the second shield connector 712. Providing the clampmay help achieve one or more certification requirements of acertification body, such as a certification requirement of UnderwritersLaboratories (UL).

Example dimensions for the example of FIGS. 29-30 are as follows fordifferent motors having different HP ratings.

HP A E F J M O 1 3.00 0.551 0.315 1.315 0.8425 0.0625 2 3.00 0.551 0.3151.315 0.8425 0.0625 3 3.00 0.551 0.315 1.315 0.8425 0.0625 5 3.00 0.5510.315 1.381 0.8095 0.0625 10 3.00 0.551 0.315 1.381 0.8095 0.0625 153.00 0.827 0.315 1.472 0.7640 0.0625 20 4.00 0.827 0.315 1.925 1.03750.0625 25 4.00 0.827 0.315 1.925 1.0375 0.0625 30 4.00 0.827 0.315 1.9251.0375 0.0625 40 4.00 1.043 0.315 1.924 1.0380 0.0625 50 4.00 1.3780.315 0.708 1.6460 0.0625 60 4.00 1.378 0.315 0.708 1.6460 0.0625 754.00 1.378 0.315 0.708 1.6460 0.0625 100 6.00 1.902 0.433 2.879 1.56050.0625 125 6.00 1.902 0.433 2.879 1.5605 0.0625 150 6.00 1.902 0.4332.985 1.5075 0.0625 200 6.00 2.165 0.512 2.985 1.5075 0.0625 HP Q S T VW X 1 1.000 0.426 0.125 1.750 0.5625 0.188 2 1.000 0.426 0.125 1.7500.5625 0.188 3 1.000 0.426 0.125 1.750 0.5625 0.188 5 1.000 0.426 0.1251.750 0.5625 0.188 10 1.000 0.426 0.125 1.750 0.5625 0.188 15 1.0000.702 0.125 1.750 0.5625 0.188 20 1.000 0.702 0.125 1.750 0.5625 0.18825 1.000 0.702 0.125 1.750 0.5625 0.188 30 1.000 0.702 0.125 1.7500.5625 0.188 40 1.000 0.918 0.125 1.750 0.5625 0.188 50 1.000 1.2530.250 1.750 0.5625 0.188 60 1.000 1.253 0.250 1.750 0.5625 0.188 751.000 1.253 0.250 1.750 0.5625 0.188 100 1.000 1.777 0.250 1.750 0.56250.188 125 1.000 1.777 0.250 1.750 0.5625 0.188 150 1.000 1.777 0.2501.750 0.5625 0.188 200 1.000 2.040 0.250 1.750 0.5625 0.188

FIG. 31 is a side view of an example implementation of the shield device700. FIG. 32 is a front view of the example implementation of the shielddevice 700 of FIG. 31. FIG. 33 is a top view of the exampleimplementation of the shield device 700 of FIG. 31.

The shield device 700 includes the first shield connector 708, thesecond shield connector 712, and the electrical conductor 704. In thisexample, the shield device 700 includes one or more DIN rail connectors3004. While the example of two DIN rail connectors 3004 is shown, theshield device 700 may include one DIN rail connector 3004 or more thantwo DIN rail connectors 3004.

The electrical conductor 704 may have an L-shaped cross-section, asillustrated in FIG. 31. The electrical conductor may be made of aluminumor another suitable electrically conductive material. Having theL-shaped cross-section, the electrical conductor 704 includes a verticalportion 3008 and a horizontal portion 3012 that is perpendicular to thevertical portion 3008.

The DIN rail connector(s) 3004 are configured to couple (and hang) theshield device 700 to the second DIN rail 1204. The second DIN rail 1204may be, for example, a 15 mm DIN rail, a 35 mm DIN rail, or anothersuitable type of DIN rail. The DIN rail connectors 3004 have one or morefeatures 3016 configured to securely hold the shield device 700 to thesecond DIN rail 1204. The DIN rail connectors 3004 are also releasablefrom the second DIN rail 1204.

The DIN rail connectors 3004 are electrical insulators and may be madeof, for example, a dielectric material or another suitable type ofelectrically insulative/isolative material. The DIN rail connectors 3004therefore electrically isolate the electrical conductor 704 from thesecond DIN rail 1204 and any other components that are electricallyconnected to the second DIN rail.

The DIN rail connectors 3004 may be fixed to the electrical conductor704 via one or more fasteners, such as screws 3020. In variousimplementations, the DIN rail connectors 3004 may be fixed to theelectrical conductor 704 in another suitable manner, such as via anadhesive or via one or more other types of fasteners. In an example, thescrews 3020 may be #6-32×⅜″ screws. The holes for the screws 3020through the electrical conductor 704 may be countersunk.

The shield device 700 includes apertures 3024 in the horizontal portion3012 for the first and second shield connectors 708 and 712. The firstand second shield connectors 708 and 712 are electrically conductive andare electrically connected to the electrical conductor 704. For example,threads may be formed on inner surfaces of the apertures 3024, and thefirst and second shield connectors 708 and 712 may include threadsformed on their radially outer surfaces. The threads on the outersurfaces of the first and second shield connectors 708 and 712 may bethreaded onto the threads on the inner surfaces of the apertures 3024.In various implementations, the first and second shield connectors 708and 712 may be fixed to the electrical conductor 704 in another suitablemanner, such as via an electrically conductive adhesive or via one ormore other types of fasteners. In this example, the first and secondshield connectors 708 and 712 are electrically conductive cable glands,for example, from the Lapp Group. The first and second shield connectors708 and 712 may be made of, for example, aluminum, steel, copper, oranother suitable electrically conductive material.

The first and second shield connectors 708 and 712 are configured toelectrically contact as much of the 360 degree surface area of theshield portions (once exposed) of the first and second lengths 504 and508 of the shielded cable as possible. The first and second shieldconnectors 708 and 712 engage and hold the shield portions of the firstand second lengths 504 and 508 and electrically connect the shieldportions with the electrical conductor 704.

Example dimensions for the example of FIGS. 31-33 are as follows fordifferent motors having different HP ratings.

HP A B C D E F G H I 1 3.00 2.00 0.25 0.25 0.945 1.674 0.370 0.370 1.6252 3.00 2.00 0.25 0.25 0.945 1.674 0.370 0.370 1.625 3 3.00 2.00 0.250.25 0.945 1.674 0.370 0.370 1.625 5 3.00 2.00 0.25 0.25 1.142 1.7530.239 0.239 1.625 10 3.00 2.00 0.25 0.25 1.142 1.753 0.239 0.239 1.62515 3.00 2.00 0.25 0.25 1.418 1.93 0.055 0.055 1.625 20 4.00 2.00 0.250.25 1.773 2.264 0.151 0.151 1.625 25 4.00 2.00 0.25 0.25 1.773 2.2640.151 0.151 1.625 30 4.00 2.00 0.25 0.25 1.773 2.264 0.151 0.151 1.62540 4.00 2.00 0.25 0.25 1.773 2.264 0.151 0.151 1.625 50 6.00 3.00 0.250.25 2.127 2.423 0.582 0.582 1.625 60 6.00 3.00 0.25 0.25 2.127 2.4230.582 0.582 1.625 75 6.00 3.00 0.25 0.25 2.127 2.423 0.582 0.582 1.625100 6.00 3.00 0.25 0.25 2.639 2.482 0.241 0.241 1.625 125 6.00 3.00 0.250.25 2.639 2.482 0.241 0.241 1.625 150 7.00 3.00 0.25 0.25 2.955 2.8360.363 0.363 1.625 200 7.00 3.00 0.25 0.25 2.955 2.836 0.363 0.363 1.625250 8.00 3.00 0.25 0.250 3.743 4.137 0.171 0.171 1.625 300 8.00 3.000.25 0.25 3.743 4.137 0.171 0.171 1.625 HP J K L M1 N O M P AF 1 0.755.000 0.375 NPT ½ 1.000 0.3125 0.500 1.313 2.00 2 0.75 5.000 0.375 NPT ½1.000 0.3125 0.500 1.313 2.00 3 0.75 5.000 0.375 NPT ½ 1.000 0.31250.500 1.313 2.00 5 0.75 5.000 0.375 NPT ¾ 1.000 0.3125 0.750 1.313 2.0010 0.75 5.000 0.375 NPT ¾ 1.000 0.3125 0.750 1.313 2.00 15 0.75 5.0000.375 NPT 1 1.000 0.3125 1.000 1.313 2.00 20 0.75 6.000 0.375 NPT 1¼1.000 0.3125 1.250 1.313 3.00 25 0.75 6.000 0.375 NPT 1¼ 1.000 0.31251.250 1.313 3.00 30 0.75 6.000 0.375 NPT 1¼ 1.000 0.3125 1.250 1.3133.00 40 0.75 6.000 0.375 NPT 1¼ 1.000 0.3125 1.250 1.313 3.00 50 0.758.000 0.375 NPT 1½ 1.000 0.3125 1.500 1.313 3.00 60 0.75 8.000 0.375 NPT1½ 1.000 0.3125 1.500 1.313 3.00 75 0.75 8.000 0.375 NPT 1½ 1.000 0.31251.500 1.313 3.00 100 0.75 10.250 0.375 NPT 2 1.000 0.3125 2.000 1.3133.50 125 0.75 10.250 0.375 NPT 2 1.000 0.3125 2.000 1.313 3.50 150 0.7511.250 0.375 NPT 2 plus 1.000 0.3125 2.250 1.313 4.00 200 0.75 11.2500.375 NPT 2 plus 1.000 0.3125 2.250 1.313 4.00 250 0.75 9.000 0.375 M75× 1.5 1.000 0.3125 2.250 1.313 5.00 M75 × 1.5 300 0.75 9.000 0.375 plus1.000 0.3125 2.250 1.313 5.00

FIG. 34 is a close up front view of the example of the shield device 700of FIGS. 31-33. FIG. 35 is a zoomed out front side view of the shielddevice 700 of FIGS. 31-33. FIG. 35 also illustrates the disconnect 300and one of the terminal blocks 400. While the example of FIG. 35illustrates the inclusion of an isolator, the example of FIG. 35 couldalternatively be hung from a DIN rail.

FIG. 36 includes a front view of an example of the shield devices 700 ofFIGS. 31-35 with the clamps 720. FIG. 37 includes a side view of theexample of the shield devices 700 of FIGS. 31-35 with the clamps 720.

The clamps 720 may be configured to grasp the insulators 1208 of theshielded cable and vertically support the shielded cables. The clamps720 may be non-conductive (electrically) clamps. For example only, theclamps 720 may be made of a plastic. In various implementations, theclamps 720 may include tie wraps (e.g., zip ties) that encircle theinsulators 1208 and that extend through holes 3504 in a clamp bracket3508. The clamps 720 may be manually adjustable or non-adjustable.Providing the clamps 720 may help achieve one or more certificationrequirements, such as a certification requirement of UnderwritersLaboratories (UL).

The clamp bracket 3508 may have an L-shaped cross-section as shown inFIG. 37. Having the L-shaped cross-section, the clamp bracket 3508includes a vertical portion 3512 and a horizontal portion 3516 that isperpendicular to the vertical portion 3512. The holes 3504 extendthrough the horizontal portion 3516. The clamp bracket 3508 may be fixedto the electrical conductor 704, such as via one or more fasteners 3520or in another suitable manner. The fasteners 3520 may be, for example,screws or another suitable type of fastener. The clamp bracket 3508 maybe an electrical insulator and may be made of, for example, a dielectricmaterial or another suitable type of electrically insulative/isolativematerial. This may reduce cost. Alternatively, the clamp bracket 3508may be electrically conductive.

Example dimensions for the example of FIGS. 36-37 are as follows fordifferent motors having different HP ratings.

HP A H S T U V W 1 3.00 0.370 3.674 1.000 0.537 0.445 0.537 2 3.00 0.3703.674 1.000 0.537 0.445 0.537 3 3.00 0.370 3.674 1.000 0.537 0.445 0.5375 3.00 0.239 3.753 1.000 0.405 0.642 0.405 10 3.00 0.239 3.753 1.0000.405 0.642 0.405 15 3.00 0.055 3.930 1.000 0.221 0.918 0.221 20 4.000.151 4.264 1.000 0.318 1.273 0.318 25 4.00 0.151 4.264 1.000 0.3181.273 0.318 30 4.00 0.151 4.264 1.000 0.318 1.273 0.318 40 4.00 0.1514.264 1.000 0.318 1.273 0.318 50 6.00 0.582 4.423 1.000 0.582 1.6270.582 60 6.00 0.582 4.423 1.000 0.582 1.627 0.582 75 6.00 0.582 4.4231.000 0.582 1.627 0.582 100 6.00 0.241 4.482 1.000 0.324 2.014 0.324 1256.00 0.241 4.482 1.000 0.324 2.014 0.324 150 7.00 0.363 4.836 1.0000.863 1.705 0.863 200 7.00 0.363 4.836 1.000 0.863 1.705 0.863 250 8.000.171 6.137 1.000 1.171 1.743 1.171 300 8.00 0.171 6.137 1.000 1.1711.743 1.171 HP X Y Z AA AB AC 1 0.125 0.375 1.125 0.375 0.375 1.000 20.125 0.375 1.125 0.375 0.375 1.000 3 0.125 0.375 1.125 0.375 0.3751.000 5 0.125 0.375 1.000 0.375 0.375 1.000 10 0.125 0.375 1.000 0.3750.375 1.000 15 0.125 0.375 0.875 0.375 0.375 1.000 20 0.125 0.375 0.7500.375 0.375 1.000 25 0.125 0.375 0.750 0.375 0.375 1.000 30 0.125 0.3750.750 0.375 0.375 1.000 40 0.125 0.375 0.750 0.375 0.375 1.000 50 0.2500.625 1.125 0.375 0.375 1.000 60 0.250 0.625 1.125 0.375 0.375 1.000 750.250 0.625 1.125 0.375 0.375 1.000 100 0.250 0.625 0.875 0.375 0.3751.000 125 0.250 0.625 0.875 0.375 0.375 1.000 150 0.250 0.625 0.7500.375 0.375 1.000 200 0.250 0.625 0.750 0.375 0.375 1.000 250 0.2500.625 0.750 0.375 0.375 1.000 300 0.250 0.625 0.750 0.375 0.375 1.000

As shown in FIG. 37, the horizontal portion 3516 of the clamp bracket3508 may extend horizontally (dimension Z in FIG. 37) such that an endface 3524 of the horizontal portion 3516 is vertically aligned with orsubstantially vertically aligned with an outer portion 3528 of the firstand second shield connectors 708 and 712. Substantially verticallyaligned may mean within 3 millimeters of a closest point.

In various implementations, the clamps 720 may be separate from theshield device 700. FIG. 38 includes a front view of an example of theclamps 720 that can be provided separately from the shield device 700.FIG. 39 includes a top view of the example of the clamps 720 of FIG. 38.FIG. 40 includes a side view of the example of the clamps 720 of FIG.38.

As stated above, the clamps 720 may be adjustable. For example, theclamps 720 may include one or more screws 3704 that engage threads in aportion 3708 of the insulator clamps 720. Turning of the screws 3704adjusts dimensions of inner apertures 3712 of the clamps 720 to retainand release the shielded cables. In the example of FIGS. 38-40, theclamps 720 may be mounted, for example, to an enclosure vertically belowthe shield device 700.

Example dimensions for the example of FIGS. 38-40 are as follows fordifferent motors having different HP ratings.

HP A B C D E F G H 1 1.000 0.500 3.00 0.509 0.500 1.509 0.588 0.806 21.000 0.500 3.00 0.509 0.500 1.509 0.588 0.806 3 1.000 0.500 3.00 0.5090.500 1.509 0.588 0.806 5 1.000 0.500 3.00 0.582 0.500 1.582 0.519 0.79910 1.000 0.500 3.00 0.582 0.500 1.582 0.519 0.799 15 1.000 0.500 3.000.656 0.500 1.656 0.436 0.817 20 1.000 0.500 4.00 0.707 0.500 1.7070.684 1.217 25 1.000 0.500 4.00 0.807 0.500 1.807 0.634 1.117 30 1.0000.500 4.00 0.807 0.500 1.807 0.634 1.117 40 1.000 0.500 4.00 1.022 0.5002.022 0.527 0.902 50 1.000 0.500 6.00 1.158 0.500 2.158 1.067 1.551 601.000 0.500 6.00 1.332 0.500 2.332 0.980 1.377 75 1.000 0.500 6.00 1.3320.500 2.332 0.980 1.377 100 2.000 1.000 6.00 1.328 1.000 2.328 0.8961.552 125 2.000 1.000 6.00 1.396 1.000 2.396 0.862 1.484 150 3.000 1.0007.00 1.801 1.000 2.801 0.940 1.517 200 3.000 1.000 7.00 1.996 1.0002.996 0.843 1.322 250 4.000 1.000 8.00 2.229 1.000 3.229 0.928 1.685 3004.000 1.000 8.00 2.468 1.000 3.468 0.809 1.446

The foregoing description is merely illustrative in nature and is in noway intended to limit the disclosure, its application, or uses. Thebroad teachings of the disclosure can be implemented in a variety offorms. Therefore, while this disclosure includes particular examples,the true scope of the disclosure should not be so limited since othermodifications will become apparent upon a study of the drawings, thespecification, and the following claims. Further, although each of theembodiments is described above as having certain features, any one ormore of those features described with respect to any embodiment of thedisclosure can be implemented in and/or combined with features of any ofthe other embodiments, even if that combination is not explicitlydescribed. In other words, the described embodiments are not mutuallyexclusive, and permutations of one or more embodiments with one anotherremain within the scope of this disclosure.

Spatial and functional relationships between elements (for example,between modules, circuit elements, semiconductor layers, etc.) aredescribed using various terms, including “connected,” “engaged,”“coupled,” “adjacent,” “next to,” “on top of,” “above,” “below,” and“disposed.” Unless explicitly described as being “direct,” when arelationship between first and second elements is described in the abovedisclosure, that relationship can be a direct relationship where noother intervening elements are present between the first and secondelements, but can also be an indirect relationship where one or moreintervening elements are present (either spatially or functionally)between the first and second elements. As used herein, the phrase atleast one of A, B, and C should be construed to mean a logical (A OR BOR C), using a non-exclusive logical OR, and should not be construed tomean “at least one of A, at least one of B, and at least one of C.”

In the figures, the direction of an arrow, as indicated by thearrowhead, generally demonstrates the flow of information (such as dataor instructions) or power that is of interest to the illustration. Forexample, when element A and element B exchange a variety of informationbut information transmitted from element A to element B is relevant tothe illustration, the arrow may point from element A to element B. Thisunidirectional arrow does not imply that no other information istransmitted from element B to element A. Further, for information sentfrom element A to element B, element B may send requests for, or receiptacknowledgements of, the information to element A.

What is claimed is:
 1. A shield device comprising: a first electricalconductor; an electrical insulator that is configured to electricallyinsulate the first electrical conductor from a second electricalconductor; a first shield connector configured to: directly contact atleast 180 degrees of a first circumference of a first shield thatsurrounds at least two first insulated conductors of a first section ofa shielded cable; and electrically connect the first shield with thefirst electrical conductor; and a second shield connector configured to:directly contact at least 180 degrees of a second circumference of asecond shield that surrounds at least two second insulated conductors ofa second section of the shielded cable; and electrically connect thesecond shield with the first electrical conductor.
 2. The shield deviceof claim 1 wherein the first electrical conductor is planar.
 3. Theshield device of claim 2 further comprising a second electricalinsulator located between the first electrical conductor and a DIN railand configured to electrically insulate the first electrical conductorfrom the DIN rail.
 4. The shield device of claim 3 further comprisingthe DIN rail.
 5. The shield device of claim 4 wherein the DIN rail isconfigured to hang one or more terminal blocks from the DIN rail.
 6. Theshield device of claim 3 wherein the second electrical insulatorincludes a dielectric paper.
 7. The shield device of claim 2 whereincenters of the first and second shield connectors are offset from avertical centerline of the shield device.
 8. The shield device of claim2 wherein centers of the first and second shield connectors are locatedon a vertical centerline of the shield device.
 9. The shield device ofclaim 2 further comprising a clamping device configured to clamp anelectrical insulator that surrounds the second shield of the secondsection of the shielded cable.
 10. A shield device comprising: a firstelectrical conductor; an electrical insulator that is configured toelectrically isolate the first electrical conductor from a secondelectrical conductor; a first shield connector configured to: directlycontact a first shield; and electrically connect the first shield withthe first electrical conductor; and a second shield connector configuredto: directly contact at least 180 degrees of a circumference of a secondshield that surrounds at least two insulated conductors of a secondsection of a shielded cable; and electrically connect the second shieldwith the first electrical conductor.
 11. The shield device of claim 10wherein the first electrical conductor is planar.
 12. The shield deviceof claim 11 further comprising a clamping device configured to clamp anelectrical insulator that surrounds the second shield of the secondsection of the shielded cable.
 13. The shield device of claim 11 whereinthe first shield is a flat braid shield.
 14. The shield device of claim11 wherein the first shield connector includes an electricallyconductive fastener configured to fasten the first shield to the firstelectrical conductor.
 15. The shield device of claim 14 wherein thefirst shield includes a flat braid connector that is electricallyconnected to an end of the first shield.
 16. The shield device of claim15 wherein the flat braid connector includes an aperture through whichthe fastener extends.
 17. A shield device comprising: a first electricalconductor having a first portion and a second portion; an electricalinsulator that is fixed to the first portion and that is configured toelectrically isolate the first electrical conductor from a secondelectrical conductor; a first cable gland that is engaged with thesecond portion of the first electrical conductor and that is configuredto: engage a first shield that surrounds at least two first insulatedconductors of a first section of a shielded cable; and electricallyconnect the first shield with the first electrical conductor; and asecond cable gland that is engaged with the second portion of the firstelectrical conductor and that is configured to: engage a second shieldthat surrounds at least two second insulated conductors of a secondsection of the shielded cable; and electrically connect the secondshield with the first electrical conductor.
 18. The shield device ofclaim 17 wherein the second portion is perpendicular to the firstportion.
 19. The shield device of claim 17 wherein: the first cablegland is coupled to a first circular aperture in the second portion ofthe first electrical conductor; and the second cable gland is coupled toa second circular aperture in the second portion of the first electricalconductor.
 20. The shield device of claim 17 wherein the firstelectrical conductor is made of aluminum.
 21. The shield device of claim17 further comprising a clamping device configured to clamp a firstelectrical insulator that surrounds the first shield of the firstsection of the shielded cable.
 22. The shield device of claim 21 whereinthe clamping device is further configured to clamp a second electricalinsulator that surrounds the second shield of the second section of theshielded cable.